Fan Xiaowei, Zhang Xianping, Wang Fengkun, et al. Research on Performance of Heat Pump Systems Using R744 /R600 and R744 /R600a Mixtures as Refrigerants[J]. Journal of refrigeration, 2011, 32(6).
DOI:
Fan Xiaowei, Zhang Xianping, Wang Fengkun, et al. Research on Performance of Heat Pump Systems Using R744 /R600 and R744 /R600a Mixtures as Refrigerants[J]. Journal of refrigeration, 2011, 32(6). DOI: 10.3969/j.issn.0253-4339.2011.06.035.
Research on Performance of Heat Pump Systems Using R744 /R600 and R744 /R600a Mixtures as Refrigerants
the system performances of R744/R600 and R744/R600a to substitute for conventional refrigerant R22 in a subcritical heating cycle were theoretically analyzed respectively with consideration of heat transfer pinch point in heat exchangers. Results show that R744/R600 and R744/R600a have different optimum mass fraction of which the system works with the maximum heating coefficient of performance (COPh). Compared to R22 system
the optimum COPh of R744/R600 and R744/R600a are increased by 11.98% and 8.24%; and increased by 36.43%
36.24% compared to pure R600 and R600a; increased by 7.07%
4.71% compared to pure R744 system in a transcritical cycle respectively. With the optimum mass fraction
condensation pressures of R744/R600 and R744/R600 are 0.84MPa and 1.18MPa lower than that of R22. Discharge temperatures are below 90℃ which are also lower than that of R22.